<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    .desk {
        display: grid;
        width: 100px;
        height: 100px;
        background-color: #ccc;  
        justify-content:center;
    }
</style>
<body>
    <div class="desk">
        <span>居中</span>
        <span>居中</span>
        <span>居中</span>
        <span>居中</span>
    </div>
    <script>

    </script>
</body>
</html>